What version of Mac OS X does SSHChain require?
SSHChain requires Mac OS X 10.5 (Leopard, but see below), Mac OS X 10.4 (Tiger) or Mac OS X 10.3.9 (Panther). It will not run on earlier versions of Panther, nor under Mac OS X 10.2 (Jaguar), at least as distributed on the download page. You may still be able to compile from the source on earlier systems.